Saw-set.



. Pateited Feb. 25, |902. M. N. DU BOIS.

SAW SET. v (Application filed Apr. 14. 1800.)

2 Sheets-Sheet l.

(No Model.)

UNITED STATES PATENT OFFICE,

MATTHEW N. DU BOIS, OF PHILADELPHIA, PENNSYLVANIA.

SAW-

SET.

SPECIFIGATION formng part of Letters Patent No. 694,142, dated February 25, 1902.

Application filed April 14:, 1900. Serial No. 12,952. (No modeli) To (LZZ whom it may concern:

Beitknown thatI, MATTHEWN. DU BOIS, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Saw-Sets; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use tle same.

My invention relates to an improved construction of machine for setting the teeth of saws, and has for its Object to produce a nachine for this purpose wherein the parts are made adjustable, so as to adapt themselves to the teeth of saws which may vary in size, and wherein also the parts are so constrncted and arranged that a uniformity of blow will be given to each tooth, thus resulting in a more perfect set than has been heretofore accomplished by the saw-sets at present in use.

My invention consists ofasaW-set having an anvil disposed thereon in line with a plunger, means for withdrawing said plunger from said anvil and for releasing it, so as contact with the teeth of the saw during the operation of setting.

My invention further consists of the novel features of construction and arrangement of parts, all of which will be hereinafter fully described, and particularly pointed out in the appended claims.

Figure 1 represents a front clevation of a saw-setting machine constructed according to my invention, showing the position of the saw in dotted lines. Fig. 2 represents a side ele- Vation thereof. Fig. 3 represents a vertical section taken on the line 3 3 of Fg. 2. Fg. 4: represents a detail perspectiv'e view of the plnnger. Fig. 5 represents a detail section taken on the line 5 5 of Fig. 1, showing the anvil and means of adjusting it to suit sawteeth of Varying sizes. In this view the saw and thelower portion of the plunger are shown in their relative positions with the anvil; and Fig. 6 represents a sectional clevation taken on the line 6 6 of Fig. 1, showing the saw in clevation and the means employed for keeping it in its proper relation with respect to the anvil and plunger.

Similar reference-numerals indicate corresponding parts in all the figures of the drawings.

In said drawings, ldesignates lhebaseof the machine, which may be of any desired size or configuration, said base being provided with a groove 2 to receive therein an adjustable anvil 3, upon which latter the saw will rest during the operation of setting the teeth.

i designates a housing supported on legs 5, which are secured to the basc 1 and between which the anvil 3 is located. The housingis provided with a centrally-disposed bore 7, within which the plunger S works, the latter being forned atitslowerextremity with a triangnlar-shaped head, (to conforn to the size and shape of. the saw-tooth,) and its upper extremity is provided with an Opening 10 to receive therein one end of the rod 11, the upper end of whichissupported in a bushing 12, seeured to the'upper extremity 14 of the housing 4. A screw 15 serves to secure said bushing 12 in place.

16 designates a vertical slot for-med in the wall of the housing 4, wherein one end of the screw 17 moves, the latter being adapted to pass through a th readed Opening in the'plunger 8 and an Opening in the rod ll, so that therod and plunger will move sinultaneously, and the latter will be prevented from rotative movement by reason of the engagement of the screw 17 with the walls of the slot 16. By this construction it will be apparent that the plunger 8 may be quickly disengaged from connection with the rod 11 and another one substitnted in instances where the teeth of the saw may vary in size.

18 designates a spiral springnterposed between the bushing 12 and the upper extremity of the plunger S, the function of which is to force the plunger down upon the anvil during the operation of setting the teeth, as will be described later on.

The wall of the housing 4: upon its outside is provided with a pin or stud 19, upon which is nounted a Wheel 20, the same being held in position by a nnt 21, adapted to a threaded end 22 of the said pin or stud 19.

23 designates cam-blocks secured to the inner surface of the Wheel 20, the same being adapted to engage the protruding end of the screw 17, as clearly shown in Figs. 1 and 2,

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oausing the plunger to rise against the action of the spring 18 until each cam-block shall have passed out of contact with said screw 17, when the pltnger will be forced down upon the tooth of the saw.

It will be observed by reference to Figs'. 2 and 5 that the upper face of the anvil 3 is beveled more or lessto suit Varying conditions and that the inner adjoining ends of the teeth rest upon the extreme uppermost part of said bevel, so that when the head of the plunger 8,which is also beveled,descends upon the tooth it will cause it to conform to such bevel.

24: designates adjustable supporting devices whereon the body of the saw Will rest during the operation of setting. These adjustable devices are preferably com posed of screws 25, having enlarged heads 26, which may be raised or lowered at the will of the operator, so as to give the saw the desired elevation.

I have provided means to compensate for the varying depths of the teeth of the saws, said means being shown clea-ly in Figs. 1, 2, 3, and 6 of the drawings ,and consisting of slotted guides 27, against the forward bent extremities 28 of which the teeth of the saw willrest. These plates are secured to the legs 5 of the housing 4 by means of set-scnews 29 and are adapted to move in either direction, so that the inner adjoining ends of the teeth nay at all times be in line or approximately in line with the highest beveled surface of the anvil 3. It will be necessary to adjust the anvil so as to accommodate itself to the adj ustment of the guide-plates 27,and for that purpose I have provided the outer end of the anvil 3 with a threaded Opening 30, adapted to receive therein the threaded shank of a screw 31, the latter being supported in a bracket 32, secured to the base 1. Thus by revolvin g the screw it will be apparent that the anvil may be moved in either direction, so as to bring it into the desired position.

It will be apparent from the foregoing that by rotation of the Wheel 20 by means of the handle 20 the cam-blocks will be noved so as to 'rapdly engage the protruding end of the screw 17, thus causing the plunger to rise and compress the spring 18, which after the screw 17 has been released by the cam -blocks 23 will cause the 'plunger to quickly descend upon the saW-tooth and conform it to the bevel of the plunger and anvil, as previously described.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Paten t, is-

1. The combination in a machine of the character described of a base having a groove in its upper surface, housing secured to the base, 'said housing having a vertical slot in one of its walls, a spring-pressed plunger operating ,in the housing, said plunger comprising a triangular-shaped head having an aperture in its top and a rod which is secured in bushing at the top of the housing and has its lower end in engagement with the aperture of the head, a pin secured to the plunger and adapted to hold the parts together, said pin working in and protruding beyond the slot of the housing, a power-Wheel secured to the honsin g, cam-blocks secured to the inner face of the Wheel and adapted to engage the protrudingend of the said pin, an adjustable anvil having its upper face beveled, said anvil being adapted to ride in the groove of the base, gude-plates on the legs of the housing, adjnstable saw-supporting devices on the base, and operating means for the power- Wheel.

2. In a saw-set the conbination with a base having a groove in its 'upper face, of an anvil adapted to slide in the said groove, the upper face of said anvil being beveled in opposite directiens from a central line, one end of said anvil having a threaded socket, a bracket fixed to the base, a screw working through the said bracket and entering the threaded socket of the anvil, and the vertically-adjustable rest-screws arranged upon the base upon opposite sides of the anvil, substantially as shown and described.

3. In a saw-set, the conbination with a base, of a housing arranged thereon and supported by suitable legs, an anvil adj nstable upon the base, the vertical guides arranged upon the base adjacent to the anvil, the horizontal guides attached to the legs of the housing, the plunger having a socket in its upper end, a spring-actuated rod working in the housing and connected to the plunger, the conplingpin for connecting the rod and plunger, the end of said pin projecting beyond the said plunger and working in a Vertical slot produced in the side of the housing, and a Wheel having cam-lifting arms adapted to engage the said pin for the purpose of raising the plunger and the spring for forcing the plunger downwardly, substantially as set forth.

In testimony whereof I affix my signature in'presence of two Witnesses.

' MATTHEW N. DU BOIS.

Witnesses:

WILLIAM ASPMAR, EDWARD J. MooRE, Jr.

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